All Notes

Gram Positive Bacilli or Rods: Introduction, List of Bacteria, Keynotes, and Related Pictures

Introduction of Gram Positive Rods (GPR)

Gram Positive Bacilli (GPB)‘ is also called Gram Positive Rods (GPR) bacteria which retain crystal violet dye and stain blue or purple on Gram’s staining. The most common medically important bacteria of GPR are Mycobacterium tuberculosis, Mycobacterium leprae, Listeria monocytogenes, Nocardia asteroides, Actinomyces israelii, Bacillus anthracis, Bacillus cereus, Bifidobacterium species, Corynebacterium diphtheriae and Clostridium species.

List of Gram Positive Bacilli

The list of Gram Positive Bacilli or Rods is as follows-

S. No.Bacteria
Medically Important GPR/GPB
1.Mycobacterium tuberculosis
2.Mycobacterium leprae
3.Listeria monocytogenes
4.Nocardia asteroides
5.Actinomyces israelii
6.Bacillus anthracis
7.Bacillus cereus
8.Bifidobacterium spp.
9. Corynebacterium diphtheriae
10Clostridium botulinum
11.Clostridium difficile
12.Clostridium perfringens
13.Clostridium tetani
Less Important GPR/GPB
14.Rhodococcus equi
15.Arcanobacterium spp.
16.Corynebacterium jeikeium
17.Corynebacterium urealyticum
18.Eggerthella species
19.Erysipelothrix rhusiopathiae
20.Eubacterium species
21.Gardnerella vaginalis
22.Gordonia spp.
23.Lactobacillus spp.
24.Mycobacterium abscessus
25.Mycobacterium avium
26.Mycobacterium bovis
27.Mycobacterium chelonae
28Mycobacterium fortuitum
29.Mycobacterium kansasii
30Mycobacterium marinum
31.Propionibacterium acnes
32.Rhodococcus equi
33.Tropheryma whippeli
34Tsukamurella spp.
35.Turicella otitidis
Table: List of Bacteria belong to GPR/GPB

Keynotes on Gram Positive Rods

  • Mycobacterium tuberculosis is weakly Gram-positive rods due to the presence of coating on its cell surface mycolic acid.
  • Actinomyces and Nocardia are gram-positive bacilli or rods characterized by filamentous and tree-like branching growth.
  • Nocardia are weakly acid-fast following staining with the modified Ziehl-Neelsen or Kinyoun’s stain whereas Actinomyces are not acid-fast.
  • Actinomyces are anaerobic but Nocardia and Streptomyces are aerobic bacteria.

Some Picture of Gram Positive Bacilli or Rods

Bacillus in Gram staining

Fig. Bacillus in Gram staining

Clostridium in Gram staining

Fig. Clostridium in Gram staining

Listeria in Gram staining

Fig. Listeria in Gram staining
Medical Lab Notes

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